Medically reviewed by Dr. David L. Greenwald, MD, FAANS, FACS — dual board-certified spine surgeon & neurosurgeon. Last reviewed October 2026.

Minimally invasive spine surgery (MIS) uses small incisions, tubular retractors, and magnification to reach the spine without cutting through the muscles the way open surgery does. The result is the same goal — decompression or fusion — with less tissue damage, less pain, and a quicker return to your life.

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What Is Minimally Invasive Spine Surgery?

Minimally invasive spine surgery is not a different operation from open surgery — it's a better way to reach the same target. The goal is identical: take pressure off a compressed nerve, stabilize a segment that has become unstable, or both. What changes is how the surgeon gets there. Instead of making a long incision and detaching muscle from the spine to expose it, Dr. Greenwald works through one or more small incisions using a tubular retractor — a system of dilators that gently spreads the muscle fibers apart rather than cutting through them — guided by live imaging and a surgical microscope.

Because the muscle is spared instead of stripped away, the body has far less collateral damage to heal from. That single difference is the reason MIS patients so often have smaller scars, less blood loss, less post-operative pain, and a faster return to the activities they love. At Desert Spine and Pain, minimally invasive technique is our first choice whenever it's safe and effective — and because Dr. Greenwald is both a spine surgeon and a neurosurgeon, the bone, the disc, and the delicate nerves are all handled by one expert.

Our Minimally Invasive Procedures

MIS isn't one procedure but a family of them, each matched to a specific problem. These are the main minimally invasive procedures Dr. Greenwald performs — most people searching for MIS don't yet know which one they need, and that's exactly what the consultation determines:

MIS vs. Traditional Open Surgery

The difference between a minimally invasive and a traditional open approach comes down to one thing: what happens to the muscle. In open surgery, the surgeon makes a longer incision and peels the back muscles off the spine to expose the bone. Those muscles have to be reattached and then heal — and much of the pain, blood loss, and prolonged recovery of traditional surgery comes not from the work done on the spine itself, but from that collateral muscle injury.

A minimally invasive approach avoids most of it. The tubular retractor dilates the muscle apart to create a narrow working channel straight to the spine, so the muscle is pushed aside rather than cut and stripped. Working through that channel with magnification and live imaging, Dr. Greenwald performs the same decompression or fusion — just without the large wound. For the right patient, that translates into real, well-established advantages:

• Less blood loss. Smaller incisions and spared muscle mean far less bleeding during the procedure.
• Less post-operative pain. With the muscle left largely intact, there's less tissue trauma to recover from — and often less reliance on pain medication afterward.
• Smaller scars and lower infection risk. A small incision heals faster and gives bacteria far less to work with than a long open wound.
• A shorter hospital stay — often outpatient. Many minimally invasive procedures are performed on a same-day basis, so you recover at home instead of in a hospital bed.
• A faster return to activity. Because less muscle was disturbed, patients typically get back to walking, working, and the things they love sooner than after equivalent open surgery.

None of this means MIS is a shortcut or a watered-down operation. The target is addressed just as completely as it would be through an open approach — the muscle simply pays a much smaller price to get there. That's the core of the minimally invasive advantage, and it's why we reach for it first.

When Is MIS an Option — and When Is Open Surgery the Right Call?

A great many spine problems can be solved with a minimally invasive approach. Conditions that are frequently candidates for MIS include:

• Herniated discs causing sciatica or radiating arm/leg pain — often treated with a muscle-sparing microdiscectomy.
• Lumbar spinal stenosis — a narrowed canal pinching the nerves, relieved by minimally invasive decompression.
• Spondylolisthesis and spinal instability — a slipped or unstable vertebra that needs stabilizing, often with a minimally invasive fusion such as TLIF, XLIF, or ILIF.
• Degenerative disc disease and contained disc problems — addressed with fusion or intradiscal procedures.
• Sacroiliac (SI) joint dysfunction — a painful, unstable SI joint treated with minimally invasive SI fusion.

But honesty is part of good surgery, and minimally invasive isn't right for everyone. Complex multi-level disease, significant spinal deformity such as scoliosis, revision of a previous operation, or certain anatomical factors can mean a traditional open approach is genuinely the safer, more effective choice — the one more likely to fully and durably fix the problem. The guiding rule is simple: a minimally invasive technique is used only when Dr. Greenwald expects it to achieve the same result or a better one than open surgery would. If an open approach is the better answer for your spine, we'll tell you so — and explain exactly why.

The Same Goal, Far Less Trauma — But Only When Surgery Is Truly Needed

Minimally invasive surgery isn't a different operation — it's a better way to reach the same target. But surgery of any kind, minimally invasive or open, is never our first step. The large majority of back and neck problems improve with conservative care and interventional pain procedures, and we exhaust those options before recommending an operation. When surgery is the right answer, Dr. Greenwald works through small ports with live imaging and magnification instead of detaching muscle from the spine — so for the right patient, that means smaller scars, less blood loss, a shorter hospital stay, and a faster recovery. Part of our job is telling you honestly when an open approach is genuinely safer. All surgical procedures are performed at an accredited affiliated surgical facility.

What to Expect — From Consultation to Recovery

Deciding on surgery should never feel rushed or one-sided. Here's how the process works at Desert Spine and Pain:

• Consultation & imaging. Dr. Greenwald reviews your history, examines you, and studies your MRI or CT to pinpoint the exact source of the problem and confirm whether it can be addressed minimally invasively.
• An honest recommendation. You'll hear whether surgery is truly warranted at all — and if a minimally invasive technique is right for your anatomy, or whether an open approach would serve you better.
• The procedure. Your operation is performed by Dr. Greenwald at an accredited affiliated surgical facility, using the least-invasive technique that will fully address the problem. Many MIS procedures are same-day, so you go home to recover.
• Recovery & follow-up. You're given a clear, personalized recovery plan and seen in follow-up to make sure you're healing and getting back to the activities you love.

Recovery & Getting Back to Life

Recovery depends on the specific procedure, but the muscle-sparing nature of MIS is exactly what tends to make it quicker. After a minimally invasive decompression or microdiscectomy, many patients are up and walking the same day and returning to light activity within a couple of weeks. A minimally invasive fusion takes longer — the bone itself still needs time to heal, often several months — but because the surrounding muscle was spared, the early recovery is typically more comfortable than with an open fusion, and activity is increased gradually along the way. Whatever the operation, you'll leave with specific instructions and a recovery timeline built around your life and your goals.

Insurance, Out-of-Network & Cost

We welcome out-of-network patients of every kind and you don't need a referral to be seen. Our team verifies your coverage and explains any out-of-pocket costs before anything is scheduled, so there are no surprises. Because many of our patients come to us after a car accident or injury, we also coordinate closely with personal-injury attorneys and offer 24/7 concierge support for accident-related spine surgery.

Proudly Serving the Greater Phoenix, Arizona Area

Why Choose Our MIS Surgeon in Phoenix

Your surgery is performed by a dual board-certified spine surgeon and neurosurgeon with deep experience in muscle-sparing techniques — a qualification few surgeons in Phoenix hold, and one that matters most when nerves are involved. Dr. Greenwald uses a minimally invasive approach whenever it's safe and effective, and has the honesty to recommend an open approach when that's the safer choice. We welcome out-of-network patients, require no referral, and coordinate with personal-injury attorneys for accident-related spine surgery.

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Minimally Invasive Spine Surgery: Frequently Asked Questions